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1. System introduction
1.1 System Introduction
This system is a complete and efficient intelligent management system developed by using wireless sensor network and RFID radio frequency identification technology, by installing RFID hardware and corresponding functional software, aiming at the actual situation of the management of the elderly.
1.2 System characteristics
(1) Advanced RFID equipment technology
RFID active tag technology can read data through external materials; it has a long service life and can work in harsh environments; it has a longer reading distance; it can write and access data, and the writing time is fast; the content of the tag can be dynamically changed It can handle multiple tags at the same time; the data access of the tags is protected by a password, and the security is higher; it can track and locate the objects attached to the tags.
(2) The system has a high degree of maturity
It has the characteristics of low cost, low power consumption, stability and confidentiality, and can run independently without relying on other systems. Fully consider the reliability and security design of the network, host, operating system, database, etc.
(3) Good compatibility and scalability
It adopts advanced computer application technology and has good expandability. The open system structure and long-term life cycle can meet the needs of developing new functions in the future; the data obtained by the system through GPRS or serial port can be seamlessly connected with the system.
2. System introduction
2.1 System overview
1) Distribute a key card tag or wristband tag to each elderly person. The tag stores a unique ID number as the unique identification of the person. It can also store the person’s simple information: name, apartment, room, etc., contact information, Children’s information, etc.;
2) Install IoT omnidirectional monitors on important roads and lakesides in the community to realize personnel positioning and determination.
3) Through the recording of the information read by the omnidirectional monitor of the Internet of Things, all the elderly can be located in the area. By connecting the readers that all the elderly pass through, you can know the approximate route that the person has passed by, and support historical trajectory query.
4) Deploy the IoT directional monitor at the entrance and exit of the community to realize the functions of determining the entrance and exit of the elderly and recording the entrance and exit time of the elderly.
2.2 Equipment layout
1. The small red dot represents the omnidirectional monitor of the Internet of Things (realize personnel positioning)
2. The pink rectangle represents the IoT directional monitor (determining people entering and leaving the community)
3. The green hexagon represents the IoT network repeater (accepts all the information from the IoT directional monitor and uploads the data to the host computer)
2.3 Device function
2.3.1 Introduction to equipment principle
IoT omnidirectional monitor (card reader)
Mainly used in outdoor environments. In a completely unobstructed environment, the recognition distance of the card reader can reach up to 500 meters. In environments such as buildings, it is recommended that the card reading distance be 30 meters-80 meters. This IoT omnidirectional monitor adopts a waterproof case, which can work normally even in harsh environments. According to the actual situation, the outdoor area can be divided into several small areas for management. Each area is equipped with an IoT omnidirectional monitor. When the tag enters the identification area, it can be based on the attenuation between the IoT omnidirectional monitor and the tag. The value is used to judge the position of the person. The closer the tag is to the omnidirectional monitor of the Internet of Things, the faster the capture efficiency will be, and the slower the capture rate will be. At the same time, the Internet of Things omnidirectional monitor can also provide multiple interfaces such as 485/232/network port/GPRS/WIFI, which is convenient for users to choose. The positioning accuracy of the Zigbee network of multiple devices is 5-15 meters, as shown in the form of reading tags by the omnidirectional monitor of the Internet of Things.
IoT network repeater
It is used to collect the data of the IoT directional monitor and the IoT wireless node, and then transmit it to the system terminal through wire or wireless. Usually 4-6 IoT directional monitors and IoT wireless nodes use an IoT network repeater. At the same time, the IoT network repeater also provides multiple interfaces such as 485/232/network port/GPRS/WIFI, which is convenient for users to choose. Figure 6 shows the form of data received by the IOT network repeater.
2.3.2 Equipment specific configuration
IoT orientation monitor device configuration
The first layer of Zigbee network: electronic label
The second layer of Zigbee network: IoT wireless node & IoT directional monitor-IoT network repeater
The third layer of Zigbee network: data collector-master control platform
IoT omnidirectional monitor device configuration
The first layer of Zigbee network: electronic label-omnidirectional monitor of the Internet of Things
The second layer of Zigbee network: data collector-master control platform
2.4 Function realization
2.4.1 Elderly management
Distribute a card tag or wristband tag to each elderly person. The tag stores a unique ID number that can uniquely identify the elderly person. It can also store simple information about the elderly: name, apartment, room, etc., contact information, and children’s information Etc.; other detailed information is stored in the back-end database corresponding to this ID number for management personnel to query and access.
Because the card tag is active and sends signals all the time, every elderly person holding the card tag will read the content of the tag when he enters his work area.
When the card reader reads the information, it sends the data to the upper computer of the system through the communication interface, and compares it with the information of the old man in the upper computer: if the information of the old man matches the information in the background database, it can be entered smoothly;
Timely count the information of all the old people in the community. If the old people have physical or other conditions, they can press the button to report to the police. The monitoring center can immediately know the location information of the old people.
The video linkage function can be selected. After a button alarm occurs, the system analyzes the location of the old man and automatically calls the nearby camera to check the situation.
2.4.2 Whole-process regional positioning
When each elderly person holding an electronic card tag enters the corresponding area, the IoT omnidirectional monitor on each road reads the tag, determines which area he is in, locates it, and the card reader reads it through the communication interface. The information of the elderly is sent to the upper computer of the control terminal, and the upper computer records the movement track of the elderly, and can locate the area of the elderly. The monitoring personnel can query the location of an elderly person through the upper computer.
2.4.3 Button alarm/shake wristband alarm (optional)
Each wristband tag and card-type tag has a button. If the old person has a physical condition, the old person can alarm by pressing the button. The alarm signal will be sent to the monitoring center through the Internet of Things omnidirectional monitor, and its location will be displayed on the electronic map. , And notify nearby staff through the intercom system to check in the past.
2.4.4 Viewing the travel route
When an elderly person holding an electronic tag passes through a card reader arranged in each area, the card reader will record the information and appearance time of the tag at this time. Connect these passing card readers to know the approximate route of the person.
2.4.5 Records of entering and leaving the community
After the elderly with electronic tags pass through the entrance and exit of the community, the system will automatically record the time of entry and exit of their electronic tags, the name of the elderly, etc., for later query.
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